Merge branch 'feature/use_dependency_injection_for_categories' into 'develop'

 Use dependency injection for categories controller

See merge request !19

build.gradle

@@ -5,6 +5,10 @@ plugins {
 	id 'war'
 }
 
+tasks {
+    compileJava.inputs.files(processResources)
+}
+
 group = 'fr.unistra.sil'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '1.8'
@@ -24,6 +28,7 @@ dependencies {
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
 
     implementation 'org.thymeleaf:thymeleaf-spring5'
+    annotationProcessor "org.springframework.boot:spring-boot-configuration-processor"
 }
 
 javadoc {

src/main/java/fr/unistra/sil/erp/back/DatabaseSystem.java

-/*
- * CONTRAT DE LICENCE DE LOGICIEL LIBRE CeCILL-B
- * https://cecill.info/licences/Licence_CeCILL-B_V1-fr.html
- */
-package fr.unistra.sil.erp.back;
-
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
-import fr.unistra.sil.erp.back.db.DatabaseSQLiteImpl;
-import fr.unistra.sil.erp.back.db.IDatabase;
-
-/**
- * Manages the database implementation to use.
- * @author BEAUVAIS ANTOINE
- */
-public class DatabaseSystem {
-    
-    /**
-     * The database implementation object.
-     */
-    private static IDatabase instance;
-    
-    /**
-     * Returns the database implementation in use.In order to change the 
-     * implementation, simply change this method's implementation construction 
-     * to the desired one.
-     * 
-     * @return the instance of the database implementation.
-     * @throws DatabaseConnectionException if the connection to the DB failed.
-     */
-    public static IDatabase getInstance() throws DatabaseConnectionException
-    {
-        if(DatabaseSystem.instance == null)
-            DatabaseSystem.instance = new DatabaseSQLiteImpl();
-        
-        if(DatabaseSystem.instance == null)
-            throw new DatabaseConnectionException("Failed to create DB.");
-        
-        return DatabaseSystem.instance;
-    }
-}

src/main/java/fr/unistra/sil/erp/back/WebMvcConfig.java

@@ -5,45 +5,47 @@
 package fr.unistra.sil.erp.back;
 
 import fr.unistra.sil.erp.back.interceptor.api.ApiAuthenticationInterceptor;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.PropertySource;
-import org.springframework.context.annotation.PropertySources;
+import org.springframework.context.annotation.*;
 import org.springframework.core.env.Environment;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
 /**
  * Main configuration file for the application.
+ *
  * @author BEAUVAIS ANTOINE
  */
 @Configuration
-@PropertySources(
-        @PropertySource("/apikey.properties")
-)
+@EnableWebMvc
 public class WebMvcConfig implements WebMvcConfigurer {
-    
+
     /**
      * Autowired environment for retrieving properties.
      */
-    @Autowired
-    private Environment env;
-    
+    private final Environment env;
+
     /**
      * API version.
      */
     public static final String API_VERSION = "v1";
-    
+
     /**
      * API prefix.
      */
     public static final String API_PREFIX = "/api/";
-    
+
     /**
      * Prefix for API calls.
      */
     public static final String API_FULL_PREFIX = API_PREFIX + API_VERSION;
-    
+
     /**
      * API Mapping for retrieving all items.
      */
@@ -72,29 +74,47 @@ public class WebMvcConfig implements WebMvcConfigurer {
      * Web mapping for the login page.
      */
     public static final String MAPPING_LOGIN = "/login";
-    
+
     /**
      * Web mapping for the items list.
      */
     public static final String WEB_MAPPING_ITEMS = "/products";
-    
+
+    public WebMvcConfig(Environment env) {
+        this.env = env;
+    }
+
     /**
      * Adds interceptors to the application.
-     * 
-     * Interceptors process HTTP requests before they reach their 
+     * <p>
+     * Interceptors process HTTP requests before they reach their
      * attributed methods.
-     * 
-     * Currently, interceptors are only used for authentication in this 
+     * <p>
+     * Currently, interceptors are only used for authentication in this
      * application.
-     * 
+     *
      * @param registry the Interceptor Registry to use for additions.
      */
     @Override
     public void addInterceptors(InterceptorRegistry registry) {
-        
-        registry.addInterceptor(new ApiAuthenticationInterceptor(
-                this.env.getProperty("api.key")))
-                .addPathPatterns(API_PREFIX + "**");
-        
+        registry.addInterceptor(new ApiAuthenticationInterceptor(this.env.getRequiredProperty("api.key"))).addPathPatterns(API_PREFIX + "**");
+    }
+
+    /**
+     * SQL Connection object.
+     */
+    private Connection conn;
+
+    @Bean
+    public Connection connection() {
+        if (this.conn == null) {
+            try {
+                conn = DriverManager.getConnection(env.getRequiredProperty("spring.datasource.url"));
+            } catch (SQLException ex) {
+                Logger.getLogger(this.getClass().getName()).log(
+                        Level.SEVERE, "Failed to connect to SQLite file.", ex);
+            }
+        }
+        return conn;
     }
 }

src/main/java/fr/unistra/sil/erp/back/controller/IRetrieveInfoController.java

@@ -9,18 +9,19 @@ import org.springframework.web.bind.annotation.RequestParam;
 
 /**
  * Interface for designing the retrieval of articles.
+ *
  * @author BEAUVAIS ANTOINE
  */
 public interface IRetrieveInfoController {
-    
+
     /**
      * Retrieves the list of items.
+     *
      * @param cat the optional category to filter.
      * @return the list of items as a JSON response/
      * @throws Exception if the request cannot be served.
      */
-    public ResponseEntity<Object> retrieveInfo(
+    ResponseEntity<Object> retrieveInfo(
             @RequestParam(value = "category", defaultValue = "") String cat
-        ) throws Exception;
-    
+    ) throws Exception;
 }

src/main/java/fr/unistra/sil/erp/back/controller/api/ApiRetrieveCategoriesController.java

@@ -5,50 +5,46 @@
 package fr.unistra.sil.erp.back.controller.api;
 
 import static fr.unistra.sil.erp.back.WebMvcConfig.MAPPING_GETCATEGORIES;
-import fr.unistra.sil.erp.back.DatabaseSystem;
+
 import fr.unistra.sil.erp.back.controller.IRetrieveCategoriesController;
 import fr.unistra.sil.erp.back.model.Category;
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
+
 import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
+
+import fr.unistra.sil.erp.back.repository.ICategoriesRepository;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
-import fr.unistra.sil.erp.back.db.IDatabase;
 
 /**
  * REST controller for the category list.
+ *
  * @author BEAUVAIS ANTOINE
  */
 @RestController
-public class ApiRetrieveCategoriesController
-        implements IRetrieveCategoriesController {
-    
+public class ApiRetrieveCategoriesController implements IRetrieveCategoriesController {
+
+    private final ICategoriesRepository repository;
+
+    public ApiRetrieveCategoriesController(ICategoriesRepository repository) {
+        this.repository = repository;
+    }
+
     /**
      * Returns the list of categories in JSON format.
+     *
      * @return the HTTP response.
      * @throws ApiServerErrorException Database failure.
      */
     @GetMapping(MAPPING_GETCATEGORIES)
     @Override
-    public ResponseEntity<Object> getCategories() throws ApiServerErrorException
-    {
-        IDatabase db;
-        try {
-            db = DatabaseSystem.getInstance();
-        } catch (DatabaseConnectionException ex) {
-            Logger.getLogger(ApiRetrieveCategoriesController.class.getName())
-                    .log(Level.SEVERE, "Failed to connect to database.", ex);
-            throw new ApiServerErrorException("Database failure.");
-        }
-        
-        List<Category> res = db.getCategories();
-        if(res == null)
+    public ResponseEntity<Object> getCategories() throws ApiServerErrorException {
+        List<Category> res = repository.getCategories();
+        if (res == null)
             throw new ApiServerErrorException("Database failure.");
-        
+
         return new ResponseEntity<>(res, HttpStatus.OK);
     }
-    
+
 }

src/main/java/fr/unistra/sil/erp/back/controller/api/ApiRetrieveItemsController.java

@@ -5,71 +5,64 @@
 package fr.unistra.sil.erp.back.controller.api;
 
 import static fr.unistra.sil.erp.back.WebMvcConfig.MAPPING_RETRIEVEALL;
-import fr.unistra.sil.erp.back.DatabaseSystem;
+
 import fr.unistra.sil.erp.back.controller.IRetrieveInfoController;
 import fr.unistra.sil.erp.back.model.Item;
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
+
 import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
+
+import fr.unistra.sil.erp.back.repository.IItemsRepository;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
-import fr.unistra.sil.erp.back.db.IDatabase;
 
 /**
  * REST controller for the item list.
+ *
  * @author BEAUVAIS ANTOINE
  */
 @RestController
 public class ApiRetrieveItemsController implements IRetrieveInfoController {
-    
+
+    private final IItemsRepository repository;
+
+    public ApiRetrieveItemsController(IItemsRepository repository) {
+        this.repository = repository;
+    }
+
     /**
      * Returns all products as a JSON response.
+     *
      * @param cat an optional category.
      * @return a JSON response.
      * @throws ApiServerErrorException if the request could not be served.
-     * @throws ApiBadRequestException if the category parameter is invalid.
+     * @throws ApiBadRequestException  if the category parameter is invalid.
      */
     @GetMapping(MAPPING_RETRIEVEALL)
     public ResponseEntity<Object> retrieveInfo(
             @RequestParam(value = "category", defaultValue = "") String cat
-        ) throws ApiServerErrorException, ApiBadRequestException
-    {
-        IDatabase db;
-        try {
-            db = DatabaseSystem.getInstance();
-        } catch (DatabaseConnectionException ex) {
-            Logger.getLogger(ApiRetrieveItemsController.class.getName()).log(
-                    Level.SEVERE, "Could not connect to database.", ex);
-            throw new ApiServerErrorException("Database failure.");
-        }
-        
+    ) throws ApiServerErrorException, ApiBadRequestException {
         List<Item> res;
-        if(cat.equals(""))
-            res = db.getAllItems();
-        else
-        {
+        if (cat.equals(""))
+            res = repository.getAllItems();
+        else {
             int category;
-            try
-            {
+            try {
                 category = Integer.parseInt(cat);
-            }
-            catch(NumberFormatException ex)
-            {
+            } catch (NumberFormatException ex) {
                 throw new ApiBadRequestException("Category must be a integer.");
             }
-            
-            res = db.getItemsFromCategory(category);
+
+            res = repository.getItemsFromCategory(category);
         }
-        
-        if(res == null)
+
+        if (res == null)
             throw new ApiServerErrorException("Failed to query info.");
-        else if(res.isEmpty())
+        else if (res.isEmpty())
             return ResponseEntity.noContent().build();
-        
+
         return new ResponseEntity<>(res, HttpStatus.OK);
     }
 }

src/main/java/fr/unistra/sil/erp/back/controller/api/ApiRetrieveStocks.java

@@ -5,53 +5,49 @@
 package fr.unistra.sil.erp.back.controller.api;
 
 import static fr.unistra.sil.erp.back.WebMvcConfig.MAPPING_GETSTOCKS;
-import fr.unistra.sil.erp.back.DatabaseSystem;
+
 import fr.unistra.sil.erp.back.controller.IRetrieveStocks;
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
 import fr.unistra.sil.erp.back.model.Stock;
+
 import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+
+import fr.unistra.sil.erp.back.repository.IStocksRepository;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
-import fr.unistra.sil.erp.back.db.IDatabase;
 
 /**
  * Retrieves stocks in JSON format.
+ *
  * @author BEAUVAIS ANTOINE
  */
 @RestController
 public class ApiRetrieveStocks implements IRetrieveStocks {
 
+    private final IStocksRepository repository;
+
+    public ApiRetrieveStocks(IStocksRepository repository) {
+        this.repository = repository;
+    }
+
     /**
      * Sends the stocks as JSON format back to the client.
-     * @param request the HTTP request.
+     *
+     * @param request  the HTTP request.
      * @param response the HTTP response.
-     * @return the response. 
+     * @return the response.
      * @throws ApiServerErrorException if the request could not be served.
      */
     @GetMapping(MAPPING_GETSTOCKS)
     @Override
-    public ResponseEntity<Object> retrieveStocks(HttpServletRequest request,
-            HttpServletResponse response) throws ApiServerErrorException {
-        IDatabase db;
-        try {
-            db = DatabaseSystem.getInstance();
-        } catch (DatabaseConnectionException ex) {
-            Logger.getLogger(ApiRetrieveCategoriesController.class.getName())
-                    .log(Level.SEVERE, "Failed to connect to database.", ex);
+    public ResponseEntity<Object> retrieveStocks(HttpServletRequest request, HttpServletResponse response) throws ApiServerErrorException {
+        List<Stock> res = repository.getStocks();
+        if (res == null)
             throw new ApiServerErrorException("Database failure.");
-        }
-        
-        List<Stock> res = db.getStocks();
-        if(res == null)
-            throw new ApiServerErrorException("Database failure.");
-        
+
         return new ResponseEntity<>(res, HttpStatus.OK);
     }
-    
 }

src/main/java/fr/unistra/sil/erp/back/controller/api/ApiSubmitTransactionController.java

@@ -6,51 +6,60 @@ package fr.unistra.sil.erp.back.controller.api;
 
 import com.google.gson.Gson;
 import com.google.gson.JsonParseException;
+
 import static fr.unistra.sil.erp.back.WebMvcConfig.MAPPING_SUBTRANSAC;
-import fr.unistra.sil.erp.back.DatabaseSystem;
+
 import fr.unistra.sil.erp.back.controller.ISubmitTransactionController;
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
-import fr.unistra.sil.erp.back.db.DatabaseResourceNotFoundException;
-import fr.unistra.sil.erp.back.db.DatabaseUpdateException;
+import fr.unistra.sil.erp.back.repository.DatabaseConnectionException;
+import fr.unistra.sil.erp.back.repository.DatabaseResourceNotFoundException;
+import fr.unistra.sil.erp.back.repository.DatabaseUpdateException;
 import fr.unistra.sil.erp.back.model.Stock;
 import fr.unistra.sil.erp.back.model.Transaction;
+
 import java.io.IOException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+
+import fr.unistra.sil.erp.back.repository.IStocksRepository;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;
-import fr.unistra.sil.erp.back.db.IDatabase;
 
 /**
  * REST Controller for submitting transactions.
+ *
  * @author BEAUVAIS ANTOINE
  */
 @RestController
-public class ApiSubmitTransactionController
-        implements ISubmitTransactionController {
-    
+public class ApiSubmitTransactionController implements ISubmitTransactionController {
+
+    private final IStocksRepository repository;
+
+    public ApiSubmitTransactionController(IStocksRepository repository) {
+        this.repository = repository;
+    }
+
     /**
      * Handler for transaction submissions.
-     * @param request the HTTP Servlet Request provided by Spring.
+     *
+     * @param request  the HTTP Servlet Request provided by Spring.
      * @param response the HTTP Servlet Response provided by Spring.
      * @return the response for the user.
-     * @throws ApiBadRequestException if the query failed.
-     * @throws ApiServerErrorException Server error.
+     * @throws ApiBadRequestException       if the query failed.
+     * @throws ApiServerErrorException      Server error.
      * @throws ApiResourceNotFoundException Stock not found.
      */
-    @RequestMapping(value=MAPPING_SUBTRANSAC, method = RequestMethod.POST)
+    @RequestMapping(value = MAPPING_SUBTRANSAC, method = RequestMethod.POST)
     @Override
     public ResponseEntity<Object> submitTransaction(HttpServletRequest request,
-            HttpServletResponse response)
+                                                    HttpServletResponse response)
             throws ApiBadRequestException, ApiServerErrorException,
-                   ApiResourceNotFoundException
-    {
+            ApiResourceNotFoundException {
         Gson gson = new Gson();
         String body;
         try {
@@ -61,46 +70,39 @@ public class ApiSubmitTransactionController
                     .log(Level.SEVERE, "Unparseable body.", ex);
             throw new ApiBadRequestException("Unparseable body.");
         }
-        if(body == null)
+        if (body == null)
             throw new ApiBadRequestException("Missing JSON body.");
-        
+
         Transaction t;
-        try
-        {
+        try {
             t = gson.fromJson(body, Transaction.class);
-        }
-        catch(JsonParseException ex)
-        {
+        } catch (JsonParseException ex) {
             throw new ApiBadRequestException("Invalid JSON: syntax error.");
         }
-        
-        if(t == null)
+
+        if (t == null)
             throw new ApiBadRequestException("Missing JSON body.");
-        
-        if(!t.checkIfValid())
+
+        if (!t.checkIfValid())
             throw new ApiBadRequestException("Invalid JSON schema.");
-        
-        IDatabase db;
+
         Stock s;
         try {
-            db = DatabaseSystem.getInstance();
-            s = db.getStockForItem(t.getItem());
-            if(s == null)
+            s = repository.getStockForItem(t.getItem());
+            if (s == null)
                 throw new ApiServerErrorException("Database failure.");
-            
+
             int newQuantity = s.getQuantity() + t.getQuantity();
-            if(newQuantity < 0)
+            if (newQuantity < 0)
                 newQuantity = 0;
-            
-            db.updateStock(s.getId(), newQuantity);
+
+            repository.updateStock(s.getId(), newQuantity);
         } catch (DatabaseConnectionException ex) {
             Logger.getLogger(ApiSubmitTransactionController.class.getName())
                     .log(Level.SEVERE, ex.getMessage(), ex);
             throw new ApiServerErrorException("Database failure.");
         } catch (DatabaseResourceNotFoundException ex) {
-            //Logger.getLogger(ApiSubmitTransactionController.class.getName())
-            //        .log(Level.SEVERE, null, ex);
-            throw new ApiResourceNotFoundException("No stock found for item " + 
+            throw new ApiResourceNotFoundException("No stock found for item " +
                     t.getItem());
         } catch (DatabaseUpdateException ex) {
             Logger.getLogger(ApiSubmitTransactionController.class.getName())
@@ -110,5 +112,5 @@ public class ApiSubmitTransactionController
 
         return new ResponseEntity<>(t, HttpStatus.CREATED);
     }
-    
+
 }

src/main/java/fr/unistra/sil/erp/back/controller/web/WebProductsController.java

 package fr.unistra.sil.erp.back.controller.web;
 
-
-import fr.unistra.sil.erp.back.DatabaseSystem;
 import static fr.unistra.sil.erp.back.WebMvcConfig.WEB_MAPPING_ITEMS;
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
+
 import fr.unistra.sil.erp.back.model.Item;
+
 import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
+
+import fr.unistra.sil.erp.back.repository.IItemsRepository;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -19,26 +18,29 @@ import org.springframework.web.bind.annotation.GetMapping;
 
 /**
  * Web Controller for the item list.
+ *
  * @author BEAUVAIS ANTOINE
  */
 @Controller
 public class WebProductsController {
-    
+
+    private final IItemsRepository repository;
+
+    public WebProductsController(IItemsRepository repository) {
+        this.repository = repository;
+    }
+
     /**
      * Handles the item list view.
+     *
      * @param model the view's model.
      * @return the template to use.
      */
     @GetMapping(WEB_MAPPING_ITEMS)
-    public String products(Model model)
-    {
-        try {
-            List<Item> li = DatabaseSystem.getInstance().getAllItems();
-            model.addAttribute("items", li);
-        } catch (DatabaseConnectionException ex) {
-            Logger.getLogger(WebProductsController.class.getName()).log(Level.SEVERE, null, ex);
-        }
+    public String products(Model model) {
+        List<Item> li = repository.getAllItems();
+        model.addAttribute("items", li);
+
         return "items";
     }
-    
 }

src/main/java/fr/unistra/sil/erp/back/controller/web/WebRegistryController.java

@@ -4,37 +4,46 @@
  */
 package fr.unistra.sil.erp.back.controller.web;
 
-import fr.unistra.sil.erp.back.DatabaseSystem;
-import fr.unistra.sil.erp.back.db.DatabaseConnectionException;
+import fr.unistra.sil.erp.back.repository.DatabaseConnectionException;
 import fr.unistra.sil.erp.back.model.RegistryEntry;
-import fr.unistra.sil.erp.back.model.Stock;
+
 import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+
+import fr.unistra.sil.erp.back.repository.IRegistryRepository;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
 
 /**
  * Web controller for the registry display page.
+ *
  * @author antoine.beauvais
  */
 @Controller
 public class WebRegistryController {
-    
+
+    private final IRegistryRepository repository;
+
+    public WebRegistryController(IRegistryRepository repository) {
+        this.repository = repository;
+    }
+
     /**
      * Returns the registry view for the Web interface.
+     *
      * @param model the model to populate the template with.
      * @return the view.
      */
     @GetMapping("registry")
     public String stocks(Model model) {
         try {
-            List<RegistryEntry> lr = DatabaseSystem.getInstance().getRegistry();
+            List<RegistryEntry> lr = repository.getRegistry();
             model.addAttribute("stocks", lr);
         } catch (DatabaseConnectionException ex) {
             Logger.getLogger(WebRegistryController.class.getName()).log(Level.SEVERE, null, ex);
         }
         return "registry";
     }
-    
 }

src/main/java/fr/unistra/sil/erp/back/db/IDatabase.java

-/*
- * CONTRAT DE LICENCE DE LOGICIEL LIBRE CeCILL-B
- * https://cecill.info/licences/Licence_CeCILL-B_V1-fr.html
- */
-package fr.unistra.sil.erp.back.db;
-
-import fr.unistra.sil.erp.back.model.Category;
-import fr.unistra.sil.erp.back.model.Item;
-import fr.unistra.sil.erp.back.model.RegistryEntry;
-import fr.unistra.sil.erp.back.model.Stock;
-import java.util.List;
-
-/**
- * Standard interface for database implementations.
- * 
- * This interface allows the application to be able to use different
- * database systems (CSV, SQLite, MySQL...) by simply switching
- * implementations.
- * @author BEAUVAIS ANTOINE
- */
-public interface IDatabase {
-    
-    /**
-     * Returns the list of all items.
-     * @return the list of all items, or null if an error occurred.
-     */
-    public List<Item> getAllItems();
-    
-    /**
-     * Returns the list of all items for a given category.
-     * @param category the category's identifier.
-     * @return the list of items, or null if an error occurred.
-     */
-    public List<Item> getItemsFromCategory(int category);
-    
-    /**
-     * Returns the list of all categories.
-     * 
-     * @return the list of categories, or null if an error occurred.
-     */
-    public List<Category> getCategories();
-    
-    /**
-     * Returns the list of all stocks.
-     * 
-     * @return the list of stocks.
-     */
-    public List<Stock> getStocks();
-    
-    /**
-     * Returns the stock entry of an item.
-     * @param itemId the item's ID.
-     * @return the stock line.
-     * @throws DatabaseResourceNotFoundException when the query fails.
-     */
-    public Stock getStockForItem(int itemId)
-            throws DatabaseResourceNotFoundException;
-    
-    /**
-     * Updates the specified stock's quantity.
-     * @param id the stock entry's ID.
-     * @param quantity the new quantity.
-     * @throws DatabaseConnectionException when the database is unreachable.
-     * @throws DatabaseUpdateException when the query fails.
-     */
-    public void updateStock(int id, int quantity)
-            throws DatabaseConnectionException, DatabaseUpdateException;
-    
-    /**
-     * Returns all registry entries.
-     */
-    public List<RegistryEntry> getRegistry() throws DatabaseConnectionException;
-    
-}

src/main/java/fr/unistra/sil/erp/back/db/DatabaseConnectionException.java → src/main/java/fr/unistra/sil/erp/back/repository/DatabaseConnectionException.java

@@ -2,7 +2,7 @@
  * CONTRAT DE LICENCE DE LOGICIEL LIBRE CeCILL-B
  * https://cecill.info/licences/Licence_CeCILL-B_V1-fr.html
  */
-package fr.unistra.sil.erp.back.db;
+package fr.unistra.sil.erp.back.repository;
 
 /**
  * General database error.

src/main/java/fr/unistra/sil/erp/back/db/DatabaseResourceNotFoundException.java → src/main/java/fr/unistra/sil/erp/back/repository/DatabaseResourceNotFoundException.java

@@ -2,7 +2,7 @@
  * CONTRAT DE LICENCE DE LOGICIEL LIBRE CeCILL-B
  * https://cecill.info/licences/Licence_CeCILL-B_V1-fr.html
  */
-package fr.unistra.sil.erp.back.db;
+package fr.unistra.sil.erp.back.repository;
 
 /**
  * Exception for non-existent database resources.

src/main/java/fr/unistra/sil/erp/back/db/DatabaseUpdateException.java → src/main/java/fr/unistra/sil/erp/back/repository/DatabaseUpdateException.java

@@ -2,7 +2,7 @@
  * CONTRAT DE LICENCE DE LOGICIEL LIBRE CeCILL-B
  * https://cecill.info/licences/Licence_CeCILL-B_V1-fr.html
  */
-package fr.unistra.sil.erp.back.db;
+package fr.unistra.sil.erp.back.repository;
 
 /**
  * Exception for database update failures.

src/main/java/fr/unistra/sil/erp/back/repository/ICategoriesRepository.java

+package fr.unistra.sil.erp.back.repository;
+
+import fr.unistra.sil.erp.back.model.Category;
+
+import java.util.List;
+
+public interface ICategoriesRepository {
+
+    /**
+     * Returns the list of all categories.
+     *
+     * @return the list of categories, or null if an error occurred.
+     */
+    List<Category> getCategories();
+}

src/main/java/fr/unistra/sil/erp/back/repository/IItemsRepository.java

+package fr.unistra.sil.erp.back.repository;
+
+import fr.unistra.sil.erp.back.model.Item;
+
+import java.util.List;
+
+public interface IItemsRepository {
+
+    /**
+     * Returns the list of all items.
+     * @return the list of all items, or null if an error occurred.
+     */
+    List<Item> getAllItems();
+
+    /**
+     * Returns the list of all items for a given category.
+     * @param category the category's identifier.
+     * @return the list of items, or null if an error occurred.
+     */
+    List<Item> getItemsFromCategory(int category);
+}

src/main/java/fr/unistra/sil/erp/back/repository/IRegistryRepository.java

+package fr.unistra.sil.erp.back.repository;
+
+import fr.unistra.sil.erp.back.model.RegistryEntry;
+
+import java.util.List;
+
+public interface IRegistryRepository {
+    /**
+     * Returns all registry entries.
+     */
+    List<RegistryEntry> getRegistry() throws DatabaseConnectionException;
+}

src/main/java/fr/unistra/sil/erp/back/repository/IStocksRepository.java

+package fr.unistra.sil.erp.back.repository;
+
+import fr.unistra.sil.erp.back.model.Stock;
+
+import java.util.List;
+
+public interface IStocksRepository {
+    /**
+     * Returns the list of all stocks.
+     *
+     * @return the list of stocks.
+     */
+    List<Stock> getStocks();
+
+    /**
+     * Returns the stock entry of an item.
+     *
+     * @param itemId the item's ID.
+     * @return the stock line.
+     * @throws DatabaseResourceNotFoundException when the query fails.
+     */
+    Stock getStockForItem(int itemId)
+            throws DatabaseResourceNotFoundException;
+
+    /**
+     * Updates the specified stock's quantity.
+     *
+     * @param id       the stock entry's ID.
+     * @param quantity the new quantity.
+     * @throws DatabaseConnectionException when the database is unreachable.
+     * @throws DatabaseUpdateException     when the query fails.
+     */
+    void updateStock(int id, int quantity)
+            throws DatabaseConnectionException, DatabaseUpdateException;
+}

src/main/java/fr/unistra/sil/erp/back/repository/SqliteRepository.java

+package fr.unistra.sil.erp.back.repository;
+
+import org.springframework.stereotype.Repository;
+
+import java.sql.*;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+@Repository
+public class SqliteRepository {
+
+    /**
+     * SQL Connection object.
+     */
+    protected final Connection conn;
+
+    /**
+     * Class constructor.
+     */
+    public SqliteRepository(Connection conn) {
+        this.conn = conn;
+    }
+
+    /**
+     * Executes a standard query, without parameters.
+     *
+     * @param query the string's query.
+     * @return the result set for this query.
+     */
+    protected ResultSet query(String query) {
+        Statement stmt;
+        ResultSet rs;
+        try {
+            stmt = this.conn.createStatement();
+            rs = stmt.executeQuery(query);
+        } catch (SQLException ex) {
+            Logger.getLogger(this.getClass().getName()).log(
+                    Level.SEVERE, "Failed to run query: " + query, ex);
+            return null;
+        }
+
+        return rs;
+    }
+}

src/main/java/fr/unistra/sil/erp/back/repository/category/SqliteCategoryRepository.java

+package fr.unistra.sil.erp.back.repository.category;
+
+import fr.unistra.sil.erp.back.model.Category;
+import fr.unistra.sil.erp.back.repository.ICategoriesRepository;
+import fr.unistra.sil.erp.back.repository.SqliteRepository;
+import org.springframework.stereotype.Repository;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+@Repository
+public class SqliteCategoryRepository extends SqliteRepository implements ICategoriesRepository {
+
+    /**
+     * Query used to retrieve all categories stored in the database.
+     */
+    private static final String SQL_GETCATEGORIES =
+            "SELECT id, name FROM categories";
+
+    public SqliteCategoryRepository(Connection conn) {
+        super(conn);
+    }
+
+    @Override
+    public List<Category> getCategories() {
+        ResultSet rs = this.query(SQL_GETCATEGORIES);
+        if (rs == null)
+            return null;
+
+        List<Category> res = new ArrayList<>();
+        try {
+            while (rs.next()) {
+                Category c = new Category(rs.getInt("id"), rs.getString("name"));
+                res.add(c);
+            }
+        } catch (SQLException ex) {
+            Logger.getLogger(this.getClass().getName()).log(
+                    Level.SEVERE, "Failed to fetch results.", ex);
+            return null;
+        }
+
+        return res;
+    }
+}